Emergency-door apparatus for vehicles



May 10 1927.

R. D. CONKLIN \EMERGENCY DOOR APPARATUS FOR VEHICLES 3 Sheets-Sheet 1 Filed April 18, 1925 gwwentoz WWQZZJA 3 Sheets-sheaf. 2

R. D. CONKLIN EMERGENCY 000R APPARATUS FOR VEHICLES Filed April 18. 1925' May 10 1927.

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1,627,728 R. D. CONKLIN EMEEGENCY DOOR APPARATUS FOR VEHICLES 3 Shanta-Sheet 3 Filed April 18. 1925 Patented May 1927; UNITED STATES aosooa .n. comm, or may, m assreiioa ro Ila-noun. rmnarrc comm, or m roux, 1., a oonroaarrox or wasr mentor-noon mma'us Ion vnmcus. Application fled April, 1m. mm mason.

This invention relates to an emergency dooropening device, and has for 1ts ob ect the provision of means for openmg 'emer-. gency doors on vehicles, pubhc bulldmgs o and the like, as 'an emergency exit to open under certain conditions.

an emergency door.

A further object includes the PI'OVISIOD of eflicient and inexpensive means that may be attached to an emergency door whereby the emergency door is automatically unlocked f Another obJect includes the provision of means for manually operating the emergency lock. The in-.

vention in its broadest sense contemplates the application of emergency unlocking 1g. 4 1s a new echanism for releasing locked doors whershowing the details of the 4 emergency lock device; and

' Fig. 5 is a view in elevation showing a portion of the door and the hand r'elease device.

Like. numerals refer to similar part throughout the several views. 3 In closed public conveyances, such as autobuses, street cars or the like, it is essential that one or more emergency exits bepro- .closed by uickly opened for the pur vided. In autobuses, these exits are usually a door in the rear end of the vehicle, and these doors are normally locked and not used. If, however, occasion arises, the door must be so arranged that it can be ose of letting e passengers out of the ve icle to safety. I propose to 'a ply my improvedlocking and unlocking evice dlrectly to emergency doors wherever such doors are used, but for the pur e of illustration the same is shown applied to an autobus. The door 10 is normally locked by my improved device.

In an emergency, however, as when the vehicle is overturned or tilted sidewise, the lock device is automatically released and the door may be opened. I furtherprovide means for manually assisting in unlatching said door mechanism, as in the case of a front end collision or in mblic buildings.

The locking device comprises lock bolt 11, a lock release cross bar 12, a lock release rod 13, alock release cam 14, a cam weight 15, and a hand operated emergency lock release 16. The lock bolt 11 is carried on and fastened to the door 10 by a holding strap 17 and 18. Strap 17 is provided with a socket through which the bolt slides freely. The other end of the bolt slides throu h the bar 21, which is turned up from the stra 18. A bolt releasing spring 22 is tensroned by the set collar 23 on said bar, and,

normally bears against the lock release cross bar 12. This bar is carried on the end of.

the lock release rod 13a'nd the lock release rod is screwed to the door by straps 24 and These straps are provided with upstanding ears 26, 27, having holes in which rod 13 is slidably held. A tension spring 28 and set collar 29 on the lock release rod 13 hold said rod under tension and cause the cam roller 30 on the end of the lock release rod 13 t press against the release cam 14. This am is ivotally mounted on a pivot 31 to be turned thereon by a weight 15 and the tie rod 32 when the vehicle tilts sidewise or when it is overturned. The upper, end of the lock release' rod. 13 is provided with a cord 33 passing over a pulley 34 to the pull ring 16. A glass plate 35 protects the hand operated device, and a slot 36 in the door 10 afiords access to the set collar 23 for resettin the device. A spring 37 may be provide to open the-door when it is unlatc ed. A" foldable step 38 isprovided forthe convenience of passengers forced to use the emergency door. This step ca'n be lowered only when the door 'is open.-

The operation of my emer n lock is readil understood from the d cl ds ure thus far glven. Normally the device locks the emergency door by bolt 11 engaging the socket 20 and the lock release cross bar 12 being held in the path of the lock bar, as is shown, for example, by Fig. 4. The lock release cross bar is carried on the lock releaserod 13 and this rod is positively held in position by the release cam 14 and its .ten-

sion spring 28. If, now, the lock release cross bar is displaced from its bolt engafil g position, as Wlll occur, for example, w ere the release cam is displaced, then will the bolt 11 spring back out of its locking position on account of the action of the re easing spring. The door is then forced open by the spring on the door post.

The automatic action of my device is about as follows: In case of accident, whereby the vehicle is tilted to either side, the weight 15 will remain perpendicular .and this causes the cam 14 to be displaced and roller 30 with its lock release rod will snap down, carrying with it the cross bar 12 to the positions indicated in dotted lines. The

lock bolt will now spring back in the manner explained before.

The manually operated release device ma be called into service under certain conditions noted above. When this release is used, the glass shield'35 is broken and by means of the pull ring-16 the cross bar is pulled out 3f its bolt engaging position to release the oor.

While I have described a specific applica ing position, lock bolt opposing means normally positioned in the path of the lock bolt to prevent said tensioning means to be cfpermitting said lock fective, and means operated by gravity for olt opposing means to be'displaced to permit the tensioning means to become effective.

2. In an emergency lock device, the combination of a lock bolt and door to be locked, lock bolt releasing means for holding said bolt in locked position, a tension member on said means, a release cam for holding said lock boltreleasing means against movement caused by the tension member, and means for overcoming the effects of the tensioning member to thereby release said lock bolt.

3. In an emergenc lock device, the combination of a lock olt and a door to be locked, lock bolt releasing means for holding said bolt in locked position, a tension member on said means; a release cam for holding said lock bolt releasing means against movement caused by the tension member, and means including a gravity displaced cam member for permitting saidlock bolt releasing means, to be displaced and to permit the lock bolt to be wlthdrawn into ing said bolt in locked position, a tension, member on said means, a release cam forholding said lock bolt releasing means against movement caused by the tension member, and means including a cam member and a pendulum weight attached thereto wherebywhen the lock device is tilted laterallythe cam member is displaced.

' 5. In an emergency lock device for unlocking a door on vehicles, a lock bolt and a lock release device to maintain said bolt in locked position, means on said lock release device for tensioningsaid device -in one direction, a cam to oppose said tensioned release device and a pendulum on said cam whereby when the vehicle isv tilted from its normal positive distance, said cam is displaced and the lock release is rendered inefiective to hold the bolt in kicked position.

In testimony whereof I have hereunto set ijnyshand on this 7th day of April A. D

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